OpenBSD is the one that just works out of the box, the users are even discouraged from editing configuration files in there
but FreeBSD is the most capable BSD, it has GELI instead of cryptsetup and has ZFS, it is the only BSD that has prober wine support (people will tell you NetBSD also has it but it doesn't work, trust me)
you wouldn't want to check NetBSD and DragonFlyBSD right now as their upsides are very low level and unless you know C and Assembly programming you wouldn't care about them, for example NetBSD is the only system (aside from solaris) that has use their own curses library instead of ncurses, and DragonFlyBSD is one of the only free systems that has a hybird kernel (windows and macos and plan9 also has hybird kernels, none of the other BSDs has them) also DragonFlyBSD is the only system that shows instructions to install it manually (like arch linux)
tldr: just use OpenBSD if you want the system to just work(tm), and FreeBSD if you want linux capabilites like wine and steam (and a fast system as openbsd is slow as hell)